From: Wanpeng Li <wanpeng.li@linux.intel.com>
Date: Thu, 21 Aug 2014 11:46:50 +0000 (+0800)
Subject: KVM: nVMX: nested TPR shadow/threshold emulation
X-Git-Tag: fixes-for-v3.18-merge-window~23^2~61
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a7c0b07d570848e50fce4d31ac01313484d6b844;p=pandora-kernel.git

KVM: nVMX: nested TPR shadow/threshold emulation

This patch fix bug https://bugzilla.kernel.org/show_bug.cgi?id=61411

TPR shadow/threshold feature is important to speed up the Windows guest.
Besides, it is a must feature for certain VMM.

We map virtual APIC page address and TPR threshold from L1 VMCS. If
TPR_BELOW_THRESHOLD VM exit is triggered by L2 guest and L1 interested
in, we inject it into L1 VMM for handling.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
[Add PAGE_ALIGNED check, do not write useless virtual APIC page address
 if TPR shadowing is disabled. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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